biological differences

  1. Stallionus

    Which animals do you think like being masturbated, rimmed and ass play the most and the least usually?

    Except for that everybody is different and everybody has a different personality, which counts for animals as much as for us, there are perhaps also species specific distributions of what different species might like/prefer or tolerate more or less when being passively or actively mating with...
  2. Pillar

    Biological females compared to MtF Trans

    An interesting argument came up on another thread about a lady that's possibly a MtF (male-to-female) trans, but I'm unsure as to what the differences would be like anatomically speaking. Obviously, males and females have different builds from each other, but with so little experience I...